A heat recovery steam generator (HRSG) is a device that recovers waste heat from gas or steam turbines to generate steam, which can then be used for various industrial processes or to produce electrical power. It typically consists of a series of heat exchangers that transfer the waste heat from the exhaust gases of the turbines to water, resulting in the generation of high-pressure steam.
The HRSG operates on the principle of heat exchange, where the temperature difference between the waste heat and water allows for the transfer of thermal energy. This substitution of waste heat for the combustion of additional fuel enhances energy efficiency and reduces greenhouse gas emissions.
The HRSG is commonly used in combined cycle power plants, where it utilizes the waste heat from the gas turbine to produce additional power through the steam turbine. It also finds applications in various industrial processes that require steam for heating, cooling, or power generation purposes.
The design and specifications of an HRSG vary depending on factors such as the type and capacity of the turbine, the operating conditions, and the required steam parameters. They can be single or multiple pressure levels, with different types of heat exchanges including fire-tube, water-tube, or a combination of both.
Overall, a heat recovery steam generator plays a crucial role in increasing energy efficiency and reducing the environmental impact of power generation or industrial processes, by recycling waste heat and converting it into useful energy.
